The latency of DNS is usually an important factor in the Internet speed perception the user has. The faster the DNS respond to you the better browsing experience you will have.But usually all DNS servers are fast enough, the only problem you will have is how far you are from them, and how much the round trip takes. You may know that your query needs to travel all the way to the server, and then back to you.Today I have stumbled upon a nice one line script to find out which DNS server has the smallest query duration for you.